#biaoge {
    width:506px;
    margin:50px auto;
}
#biaoge li,#biaoge li.biaotou {
    list-style-type:none;
    width:100px;
    height:30px;
    line-height:30px;
    text-align:center;
    float:left;
    margin-left:1px;
    margin-bottom:1px;
    background:#ccc;
}
#biaoge li.biaotou {
    background:#999;
}